W

White
A term used within the diamond trade that describes the colourless nature of a diamond. Generally speaking, the more 'white' a stone, the greater its value.

T

Table
The large facet on top of the crown of a diamond.

Treated
A term used to describe a diamond that has been altered (other than by normal cutting and polishing) in order to change its appearance. 

S

Sawing
The method by which the diamond is cut against the grain.

Scaife
The horizontal, rotating mill or grinding wheel on which a diamond is polished..

Sights
The term given to the special sales held by D.T.C. 10 times a year where parcels of rough diamonds are presented the D.T.C. sight-holders (of which there are approximately 138 worldwide) for purchase.

Spread Stone 
A brilliant cut diamond with a large table (over 60%) and a thin crown height.

R

Rough
The term given to crystals of diamonds as they are found in mines.

Rough Girdle 
A grainy or pitted girdle, often including small nicks or scratches.

Round Brilliant Cut
The most common style of cut diamond around today. It includes 58 facets and makes the most efficient use of light in order to maximise fire and sparkle.

Q

Quality
This refers to the degree of excellence of a diamond as measured by the factors that determine it's worth, i.e., its cut, carat weight, clarity and colour.

P

Pavilion
The bottom part of a polished stone below the girdle.

Pique or PK
A term meaning a lower clarity grade with inclusions which are visible to the naked eye.

Point
One hundredth of a carat. For example a 0.35ct stone is also known as a 35 pointer.

Princess Cut
A square shaped, modified brilliant cut diamond. [Link Here Soon!] to learn more about diamond shapes

O

Open Culet 
A culet that is larger than normal.

Open Table
A larger than normal table facet.

Open Cast or Open Pit
Mining from the surface.